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mm/slab.c: proper prototypes
[wrt350n-kernel.git] / drivers / macintosh / therm_pm72.c
blob78ff186171393eaac54f54fe00a1aef4b7c276df
1 /*
2 * Device driver for the thermostats & fan controller of the
3 * Apple G5 "PowerMac7,2" desktop machines.
4 *
5 * (c) Copyright IBM Corp. 2003-2004
6 *
7 * Maintained by: Benjamin Herrenschmidt
8 * <benh@kernel.crashing.org>
9 *
10 *
11 * The algorithm used is the PID control algorithm, used the same
12 * way the published Darwin code does, using the same values that
13 * are present in the Darwin 7.0 snapshot property lists.
14 *
15 * As far as the CPUs control loops are concerned, I use the
16 * calibration & PID constants provided by the EEPROM,
17 * I do _not_ embed any value from the property lists, as the ones
18 * provided by Darwin 7.0 seem to always have an older version that
19 * what I've seen on the actual computers.
20 * It would be interesting to verify that though. Darwin has a
21 * version code of 1.0.0d11 for all control loops it seems, while
22 * so far, the machines EEPROMs contain a dataset versioned 1.0.0f
23 *
24 * Darwin doesn't provide source to all parts, some missing
25 * bits like the AppleFCU driver or the actual scale of some
26 * of the values returned by sensors had to be "guessed" some
27 * way... or based on what Open Firmware does.
28 *
29 * I didn't yet figure out how to get the slots power consumption
30 * out of the FCU, so that part has not been implemented yet and
31 * the slots fan is set to a fixed 50% PWM, hoping this value is
32 * safe enough ...
33 *
34 * Note: I have observed strange oscillations of the CPU control
35 * loop on a dual G5 here. When idle, the CPU exhaust fan tend to
36 * oscillates slowly (over several minutes) between the minimum
37 * of 300RPMs and approx. 1000 RPMs. I don't know what is causing
38 * this, it could be some incorrect constant or an error in the
39 * way I ported the algorithm, or it could be just normal. I
40 * don't have full understanding on the way Apple tweaked the PID
41 * algorithm for the CPU control, it is definitely not a standard
42 * implementation...
43 *
44 * TODO: - Check MPU structure version/signature
45 * - Add things like /sbin/overtemp for non-critical
46 * overtemp conditions so userland can take some policy
47 * decisions, like slewing down CPUs
48 * - Deal with fan and i2c failures in a better way
49 * - Maybe do a generic PID based on params used for
50 * U3 and Drives ? Definitely need to factor code a bit
51 * bettter... also make sensor detection more robust using
52 * the device-tree to probe for them
53 * - Figure out how to get the slots consumption and set the
54 * slots fan accordingly
55 *
56 * History:
57 *
58 * Nov. 13, 2003 : 0.5
59 * - First release
60 *
61 * Nov. 14, 2003 : 0.6
62 * - Read fan speed from FCU, low level fan routines now deal
63 * with errors & check fan status, though higher level don't
64 * do much.
65 * - Move a bunch of definitions to .h file
66 *
67 * Nov. 18, 2003 : 0.7
68 * - Fix build on ppc64 kernel
69 * - Move back statics definitions to .c file
70 * - Avoid calling schedule_timeout with a negative number
71 *
72 * Dec. 18, 2003 : 0.8
73 * - Fix typo when reading back fan speed on 2 CPU machines
74 *
75 * Mar. 11, 2004 : 0.9
76 * - Rework code accessing the ADC chips, make it more robust and
77 * closer to the chip spec. Also make sure it is configured properly,
78 * I've seen yet unexplained cases where on startup, I would have stale
79 * values in the configuration register
80 * - Switch back to use of target fan speed for PID, thus lowering
81 * pressure on i2c
82 *
83 * Oct. 20, 2004 : 1.1
84 * - Add device-tree lookup for fan IDs, should detect liquid cooling
85 * pumps when present
86 * - Enable driver for PowerMac7,3 machines
87 * - Split the U3/Backside cooling on U3 & U3H versions as Darwin does
88 * - Add new CPU cooling algorithm for machines with liquid cooling
89 * - Workaround for some PowerMac7,3 with empty "fan" node in the devtree
90 * - Fix a signed/unsigned compare issue in some PID loops
91 *
92 * Mar. 10, 2005 : 1.2
93 * - Add basic support for Xserve G5
94 * - Retreive pumps min/max from EEPROM image in device-tree (broken)
95 * - Use min/max macros here or there
96 * - Latest darwin updated U3H min fan speed to 20% PWM
97 *
98 * July. 06, 2006 : 1.3
99 * - Fix setting of RPM fans on Xserve G5 (they were going too fast)
100 * - Add missing slots fan control loop for Xserve G5
101 * - Lower fixed slots fan speed from 50% to 40% on desktop G5s. We
102 * still can't properly implement the control loop for these, so let's
103 * reduce the noise a little bit, it appears that 40% still gives us
104 * a pretty good air flow
105 * - Add code to "tickle" the FCU regulary so it doesn't think that
106 * we are gone while in fact, the machine just didn't need any fan
107 * speed change lately
108 *
109 */
110
111 #include <linux/types.h>
112 #include <linux/module.h>
113 #include <linux/errno.h>
114 #include <linux/kernel.h>
115 #include <linux/delay.h>
116 #include <linux/sched.h>
117 #include <linux/slab.h>
118 #include <linux/init.h>
119 #include <linux/spinlock.h>
120 #include <linux/smp_lock.h>
121 #include <linux/wait.h>
122 #include <linux/reboot.h>
123 #include <linux/kmod.h>
124 #include <linux/i2c.h>
125 #include <asm/prom.h>
126 #include <asm/machdep.h>
127 #include <asm/io.h>
128 #include <asm/system.h>
129 #include <asm/sections.h>
130 #include <asm/of_device.h>
131 #include <asm/macio.h>
132 #include <asm/of_platform.h>
133
134 #include "therm_pm72.h"
135
136 #define VERSION "1.3"
137
138 #undef DEBUG
139
140 #ifdef DEBUG
141 #define DBG(args...) printk(args)
142 #else
143 #define DBG(args...) do { } while(0)
144 #endif
145
146
147 /*
148 * Driver statics
149 */
150
151 static struct of_device * of_dev;
152 static struct i2c_adapter * u3_0;
153 static struct i2c_adapter * u3_1;
154 static struct i2c_adapter * k2;
155 static struct i2c_client * fcu;
156 static struct cpu_pid_state cpu_state[2];
157 static struct basckside_pid_params backside_params;
158 static struct backside_pid_state backside_state;
159 static struct drives_pid_state drives_state;
160 static struct dimm_pid_state dimms_state;
161 static struct slots_pid_state slots_state;
162 static int state;
163 static int cpu_count;
164 static int cpu_pid_type;
165 static pid_t ctrl_task;
166 static struct completion ctrl_complete;
167 static int critical_state;
168 static int rackmac;
169 static s32 dimm_output_clamp;
170 static int fcu_rpm_shift;
171 static int fcu_tickle_ticks;
172 static DECLARE_MUTEX(driver_lock);
173
174 /*
175 * We have 3 types of CPU PID control. One is "split" old style control
176 * for intake & exhaust fans, the other is "combined" control for both
177 * CPUs that also deals with the pumps when present. To be "compatible"
178 * with OS X at this point, we only use "COMBINED" on the machines that
179 * are identified as having the pumps (though that identification is at
180 * least dodgy). Ultimately, we could probably switch completely to this
181 * algorithm provided we hack it to deal with the UP case
182 */
183 #define CPU_PID_TYPE_SPLIT 0
184 #define CPU_PID_TYPE_COMBINED 1
185 #define CPU_PID_TYPE_RACKMAC 2
186
187 /*
188 * This table describes all fans in the FCU. The "id" and "type" values
189 * are defaults valid for all earlier machines. Newer machines will
190 * eventually override the table content based on the device-tree
191 */
192 struct fcu_fan_table
193 {
194 char* loc; /* location code */
195 int type; /* 0 = rpm, 1 = pwm, 2 = pump */
196 int id; /* id or -1 */
197 };
198
199 #define FCU_FAN_RPM 0
200 #define FCU_FAN_PWM 1
201
202 #define FCU_FAN_ABSENT_ID -1
203
204 #define FCU_FAN_COUNT ARRAY_SIZE(fcu_fans)
205
206 struct fcu_fan_table fcu_fans[] = {
207 [BACKSIDE_FAN_PWM_INDEX] = {
208 .loc = "BACKSIDE,SYS CTRLR FAN",
209 .type = FCU_FAN_PWM,
210 .id = BACKSIDE_FAN_PWM_DEFAULT_ID,
211 },
212 [DRIVES_FAN_RPM_INDEX] = {
213 .loc = "DRIVE BAY",
214 .type = FCU_FAN_RPM,
215 .id = DRIVES_FAN_RPM_DEFAULT_ID,
216 },
217 [SLOTS_FAN_PWM_INDEX] = {
218 .loc = "SLOT,PCI FAN",
219 .type = FCU_FAN_PWM,
220 .id = SLOTS_FAN_PWM_DEFAULT_ID,
221 },
222 [CPUA_INTAKE_FAN_RPM_INDEX] = {
223 .loc = "CPU A INTAKE",
224 .type = FCU_FAN_RPM,
225 .id = CPUA_INTAKE_FAN_RPM_DEFAULT_ID,
226 },
227 [CPUA_EXHAUST_FAN_RPM_INDEX] = {
228 .loc = "CPU A EXHAUST",
229 .type = FCU_FAN_RPM,
230 .id = CPUA_EXHAUST_FAN_RPM_DEFAULT_ID,
231 },
232 [CPUB_INTAKE_FAN_RPM_INDEX] = {
233 .loc = "CPU B INTAKE",
234 .type = FCU_FAN_RPM,
235 .id = CPUB_INTAKE_FAN_RPM_DEFAULT_ID,
236 },
237 [CPUB_EXHAUST_FAN_RPM_INDEX] = {
238 .loc = "CPU B EXHAUST",
239 .type = FCU_FAN_RPM,
240 .id = CPUB_EXHAUST_FAN_RPM_DEFAULT_ID,
241 },
242 /* pumps aren't present by default, have to be looked up in the
243 * device-tree
244 */
245 [CPUA_PUMP_RPM_INDEX] = {
246 .loc = "CPU A PUMP",
247 .type = FCU_FAN_RPM,
248 .id = FCU_FAN_ABSENT_ID,
249 },
250 [CPUB_PUMP_RPM_INDEX] = {
251 .loc = "CPU B PUMP",
252 .type = FCU_FAN_RPM,
253 .id = FCU_FAN_ABSENT_ID,
254 },
255 /* Xserve fans */
256 [CPU_A1_FAN_RPM_INDEX] = {
257 .loc = "CPU A 1",
258 .type = FCU_FAN_RPM,
259 .id = FCU_FAN_ABSENT_ID,
260 },
261 [CPU_A2_FAN_RPM_INDEX] = {
262 .loc = "CPU A 2",
263 .type = FCU_FAN_RPM,
264 .id = FCU_FAN_ABSENT_ID,
265 },
266 [CPU_A3_FAN_RPM_INDEX] = {
267 .loc = "CPU A 3",
268 .type = FCU_FAN_RPM,
269 .id = FCU_FAN_ABSENT_ID,
270 },
271 [CPU_B1_FAN_RPM_INDEX] = {
272 .loc = "CPU B 1",
273 .type = FCU_FAN_RPM,
274 .id = FCU_FAN_ABSENT_ID,
275 },
276 [CPU_B2_FAN_RPM_INDEX] = {
277 .loc = "CPU B 2",
278 .type = FCU_FAN_RPM,
279 .id = FCU_FAN_ABSENT_ID,
280 },
281 [CPU_B3_FAN_RPM_INDEX] = {
282 .loc = "CPU B 3",
283 .type = FCU_FAN_RPM,
284 .id = FCU_FAN_ABSENT_ID,
285 },
286 };
287
288 /*
289 * i2c_driver structure to attach to the host i2c controller
290 */
291
292 static int therm_pm72_attach(struct i2c_adapter *adapter);
293 static int therm_pm72_detach(struct i2c_adapter *adapter);
294
295 static struct i2c_driver therm_pm72_driver =
296 {
297 .driver = {
298 .name = "therm_pm72",
299 },
300 .attach_adapter = therm_pm72_attach,
301 .detach_adapter = therm_pm72_detach,
302 };
303
304 /*
305 * Utility function to create an i2c_client structure and
306 * attach it to one of u3 adapters
307 */
308 static struct i2c_client *attach_i2c_chip(int id, const char *name)
309 {
310 struct i2c_client *clt;
311 struct i2c_adapter *adap;
312
313 if (id & 0x200)
314 adap = k2;
315 else if (id & 0x100)
316 adap = u3_1;
317 else
318 adap = u3_0;
319 if (adap == NULL)
320 return NULL;
321
322 clt = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
323 if (clt == NULL)
324 return NULL;
325 memset(clt, 0, sizeof(struct i2c_client));
326
327 clt->addr = (id >> 1) & 0x7f;
328 clt->adapter = adap;
329 clt->driver = &therm_pm72_driver;
330 strncpy(clt->name, name, I2C_NAME_SIZE-1);
331
332 if (i2c_attach_client(clt)) {
333 printk(KERN_ERR "therm_pm72: Failed to attach to i2c ID 0x%x\n", id);
334 kfree(clt);
335 return NULL;
336 }
337 return clt;
338 }
339
340 /*
341 * Utility function to get rid of the i2c_client structure
342 * (will also detach from the adapter hopepfully)
343 */
344 static void detach_i2c_chip(struct i2c_client *clt)
345 {
346 i2c_detach_client(clt);
347 kfree(clt);
348 }
349
350 /*
351 * Here are the i2c chip access wrappers
352 */
353
354 static void initialize_adc(struct cpu_pid_state *state)
355 {
356 int rc;
357 u8 buf[2];
358
359 /* Read ADC the configuration register and cache it. We
360 * also make sure Config2 contains proper values, I've seen
361 * cases where we got stale grabage in there, thus preventing
362 * proper reading of conv. values
363 */
364
365 /* Clear Config2 */
366 buf[0] = 5;
367 buf[1] = 0;
368 i2c_master_send(state->monitor, buf, 2);
369
370 /* Read & cache Config1 */
371 buf[0] = 1;
372 rc = i2c_master_send(state->monitor, buf, 1);
373 if (rc > 0) {
374 rc = i2c_master_recv(state->monitor, buf, 1);
375 if (rc > 0) {
376 state->adc_config = buf[0];
377 DBG("ADC config reg: %02x\n", state->adc_config);
378 /* Disable shutdown mode */
379 state->adc_config &= 0xfe;
380 buf[0] = 1;
381 buf[1] = state->adc_config;
382 rc = i2c_master_send(state->monitor, buf, 2);
383 }
384 }
385 if (rc <= 0)
386 printk(KERN_ERR "therm_pm72: Error reading ADC config"
387 " register !\n");
388 }
389
390 static int read_smon_adc(struct cpu_pid_state *state, int chan)
391 {
392 int rc, data, tries = 0;
393 u8 buf[2];
394
395 for (;;) {
396 /* Set channel */
397 buf[0] = 1;
398 buf[1] = (state->adc_config & 0x1f) | (chan << 5);
399 rc = i2c_master_send(state->monitor, buf, 2);
400 if (rc <= 0)
401 goto error;
402 /* Wait for convertion */
403 msleep(1);
404 /* Switch to data register */
405 buf[0] = 4;
406 rc = i2c_master_send(state->monitor, buf, 1);
407 if (rc <= 0)
408 goto error;
409 /* Read result */
410 rc = i2c_master_recv(state->monitor, buf, 2);
411 if (rc < 0)
412 goto error;
413 data = ((u16)buf[0]) << 8 | (u16)buf[1];
414 return data >> 6;
415 error:
416 DBG("Error reading ADC, retrying...\n");
417 if (++tries > 10) {
418 printk(KERN_ERR "therm_pm72: Error reading ADC !\n");
419 return -1;
420 }
421 msleep(10);
422 }
423 }
424
425 static int read_lm87_reg(struct i2c_client * chip, int reg)
426 {
427 int rc, tries = 0;
428 u8 buf;
429
430 for (;;) {
431 /* Set address */
432 buf = (u8)reg;
433 rc = i2c_master_send(chip, &buf, 1);
434 if (rc <= 0)
435 goto error;
436 rc = i2c_master_recv(chip, &buf, 1);
437 if (rc <= 0)
438 goto error;
439 return (int)buf;
440 error:
441 DBG("Error reading LM87, retrying...\n");
442 if (++tries > 10) {
443 printk(KERN_ERR "therm_pm72: Error reading LM87 !\n");
444 return -1;
445 }
446 msleep(10);
447 }
448 }
449
450 static int fan_read_reg(int reg, unsigned char *buf, int nb)
451 {
452 int tries, nr, nw;
453
454 buf[0] = reg;
455 tries = 0;
456 for (;;) {
457 nw = i2c_master_send(fcu, buf, 1);
458 if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
459 break;
460 msleep(10);
461 ++tries;
462 }
463 if (nw <= 0) {
464 printk(KERN_ERR "Failure writing address to FCU: %d", nw);
465 return -EIO;
466 }
467 tries = 0;
468 for (;;) {
469 nr = i2c_master_recv(fcu, buf, nb);
470 if (nr > 0 || (nr < 0 && nr != ENODEV) || tries >= 100)
471 break;
472 msleep(10);
473 ++tries;
474 }
475 if (nr <= 0)
476 printk(KERN_ERR "Failure reading data from FCU: %d", nw);
477 return nr;
478 }
479
480 static int fan_write_reg(int reg, const unsigned char *ptr, int nb)
481 {
482 int tries, nw;
483 unsigned char buf[16];
484
485 buf[0] = reg;
486 memcpy(buf+1, ptr, nb);
487 ++nb;
488 tries = 0;
489 for (;;) {
490 nw = i2c_master_send(fcu, buf, nb);
491 if (nw > 0 || (nw < 0 && nw != EIO) || tries >= 100)
492 break;
493 msleep(10);
494 ++tries;
495 }
496 if (nw < 0)
497 printk(KERN_ERR "Failure writing to FCU: %d", nw);
498 return nw;
499 }
500
501 static int start_fcu(void)
502 {
503 unsigned char buf = 0xff;
504 int rc;
505
506 rc = fan_write_reg(0xe, &buf, 1);
507 if (rc < 0)
508 return -EIO;
509 rc = fan_write_reg(0x2e, &buf, 1);
510 if (rc < 0)
511 return -EIO;
512 rc = fan_read_reg(0, &buf, 1);
513 if (rc < 0)
514 return -EIO;
515 fcu_rpm_shift = (buf == 1) ? 2 : 3;
516 printk(KERN_DEBUG "FCU Initialized, RPM fan shift is %d\n",
517 fcu_rpm_shift);
518
519 return 0;
520 }
521
522 static int set_rpm_fan(int fan_index, int rpm)
523 {
524 unsigned char buf[2];
525 int rc, id, min, max;
526
527 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
528 return -EINVAL;
529 id = fcu_fans[fan_index].id;
530 if (id == FCU_FAN_ABSENT_ID)
531 return -EINVAL;
532
533 min = 2400 >> fcu_rpm_shift;
534 max = 56000 >> fcu_rpm_shift;
535
536 if (rpm < min)
537 rpm = min;
538 else if (rpm > max)
539 rpm = max;
540 buf[0] = rpm >> (8 - fcu_rpm_shift);
541 buf[1] = rpm << fcu_rpm_shift;
542 rc = fan_write_reg(0x10 + (id * 2), buf, 2);
543 if (rc < 0)
544 return -EIO;
545 return 0;
546 }
547
548 static int get_rpm_fan(int fan_index, int programmed)
549 {
550 unsigned char failure;
551 unsigned char active;
552 unsigned char buf[2];
553 int rc, id, reg_base;
554
555 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
556 return -EINVAL;
557 id = fcu_fans[fan_index].id;
558 if (id == FCU_FAN_ABSENT_ID)
559 return -EINVAL;
560
561 rc = fan_read_reg(0xb, &failure, 1);
562 if (rc != 1)
563 return -EIO;
564 if ((failure & (1 << id)) != 0)
565 return -EFAULT;
566 rc = fan_read_reg(0xd, &active, 1);
567 if (rc != 1)
568 return -EIO;
569 if ((active & (1 << id)) == 0)
570 return -ENXIO;
571
572 /* Programmed value or real current speed */
573 reg_base = programmed ? 0x10 : 0x11;
574 rc = fan_read_reg(reg_base + (id * 2), buf, 2);
575 if (rc != 2)
576 return -EIO;
577
578 return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift;
579 }
580
581 static int set_pwm_fan(int fan_index, int pwm)
582 {
583 unsigned char buf[2];
584 int rc, id;
585
586 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
587 return -EINVAL;
588 id = fcu_fans[fan_index].id;
589 if (id == FCU_FAN_ABSENT_ID)
590 return -EINVAL;
591
592 if (pwm < 10)
593 pwm = 10;
594 else if (pwm > 100)
595 pwm = 100;
596 pwm = (pwm * 2559) / 1000;
597 buf[0] = pwm;
598 rc = fan_write_reg(0x30 + (id * 2), buf, 1);
599 if (rc < 0)
600 return rc;
601 return 0;
602 }
603
604 static int get_pwm_fan(int fan_index)
605 {
606 unsigned char failure;
607 unsigned char active;
608 unsigned char buf[2];
609 int rc, id;
610
611 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
612 return -EINVAL;
613 id = fcu_fans[fan_index].id;
614 if (id == FCU_FAN_ABSENT_ID)
615 return -EINVAL;
616
617 rc = fan_read_reg(0x2b, &failure, 1);
618 if (rc != 1)
619 return -EIO;
620 if ((failure & (1 << id)) != 0)
621 return -EFAULT;
622 rc = fan_read_reg(0x2d, &active, 1);
623 if (rc != 1)
624 return -EIO;
625 if ((active & (1 << id)) == 0)
626 return -ENXIO;
627
628 /* Programmed value or real current speed */
629 rc = fan_read_reg(0x30 + (id * 2), buf, 1);
630 if (rc != 1)
631 return -EIO;
632
633 return (buf[0] * 1000) / 2559;
634 }
635
636 static void tickle_fcu(void)
637 {
638 int pwm;
639
640 pwm = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
641
642 DBG("FCU Tickle, slots fan is: %d\n", pwm);
643 if (pwm < 0)
644 pwm = 100;
645
646 if (!rackmac) {
647 pwm = SLOTS_FAN_DEFAULT_PWM;
648 } else if (pwm < SLOTS_PID_OUTPUT_MIN)
649 pwm = SLOTS_PID_OUTPUT_MIN;
650
651 /* That is hopefully enough to make the FCU happy */
652 set_pwm_fan(SLOTS_FAN_PWM_INDEX, pwm);
653 }
654
655
656 /*
657 * Utility routine to read the CPU calibration EEPROM data
658 * from the device-tree
659 */
660 static int read_eeprom(int cpu, struct mpu_data *out)
661 {
662 struct device_node *np;
663 char nodename[64];
664 const u8 *data;
665 int len;
666
667 /* prom.c routine for finding a node by path is a bit brain dead
668 * and requires exact @xxx unit numbers. This is a bit ugly but
669 * will work for these machines
670 */
671 sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0);
672 np = of_find_node_by_path(nodename);
673 if (np == NULL) {
674 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid node from device-tree\n");
675 return -ENODEV;
676 }
677 data = of_get_property(np, "cpuid", &len);
678 if (data == NULL) {
679 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid property from device-tree\n");
680 of_node_put(np);
681 return -ENODEV;
682 }
683 memcpy(out, data, sizeof(struct mpu_data));
684 of_node_put(np);
685
686 return 0;
687 }
688
689 static void fetch_cpu_pumps_minmax(void)
690 {
691 struct cpu_pid_state *state0 = &cpu_state[0];
692 struct cpu_pid_state *state1 = &cpu_state[1];
693 u16 pump_min = 0, pump_max = 0xffff;
694 u16 tmp[4];
695
696 /* Try to fetch pumps min/max infos from eeprom */
697
698 memcpy(&tmp, &state0->mpu.processor_part_num, 8);
699 if (tmp[0] != 0xffff && tmp[1] != 0xffff) {
700 pump_min = max(pump_min, tmp[0]);
701 pump_max = min(pump_max, tmp[1]);
702 }
703 if (tmp[2] != 0xffff && tmp[3] != 0xffff) {
704 pump_min = max(pump_min, tmp[2]);
705 pump_max = min(pump_max, tmp[3]);
706 }
707
708 /* Double check the values, this _IS_ needed as the EEPROM on
709 * some dual 2.5Ghz G5s seem, at least, to have both min & max
710 * same to the same value ... (grrrr)
711 */
712 if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) {
713 pump_min = CPU_PUMP_OUTPUT_MIN;
714 pump_max = CPU_PUMP_OUTPUT_MAX;
715 }
716
717 state0->pump_min = state1->pump_min = pump_min;
718 state0->pump_max = state1->pump_max = pump_max;
719 }
720
721 /*
722 * Now, unfortunately, sysfs doesn't give us a nice void * we could
723 * pass around to the attribute functions, so we don't really have
724 * choice but implement a bunch of them...
725 *
726 * That sucks a bit, we take the lock because FIX32TOPRINT evaluates
727 * the input twice... I accept patches :)
728 */
729 #define BUILD_SHOW_FUNC_FIX(name, data) \
730 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
731 { \
732 ssize_t r; \
733 down(&driver_lock); \
734 r = sprintf(buf, "%d.%03d", FIX32TOPRINT(data)); \
735 up(&driver_lock); \
736 return r; \
737 }
738 #define BUILD_SHOW_FUNC_INT(name, data) \
739 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
740 { \
741 return sprintf(buf, "%d", data); \
742 }
743
744 BUILD_SHOW_FUNC_FIX(cpu0_temperature, cpu_state[0].last_temp)
745 BUILD_SHOW_FUNC_FIX(cpu0_voltage, cpu_state[0].voltage)
746 BUILD_SHOW_FUNC_FIX(cpu0_current, cpu_state[0].current_a)
747 BUILD_SHOW_FUNC_INT(cpu0_exhaust_fan_rpm, cpu_state[0].rpm)
748 BUILD_SHOW_FUNC_INT(cpu0_intake_fan_rpm, cpu_state[0].intake_rpm)
749
750 BUILD_SHOW_FUNC_FIX(cpu1_temperature, cpu_state[1].last_temp)
751 BUILD_SHOW_FUNC_FIX(cpu1_voltage, cpu_state[1].voltage)
752 BUILD_SHOW_FUNC_FIX(cpu1_current, cpu_state[1].current_a)
753 BUILD_SHOW_FUNC_INT(cpu1_exhaust_fan_rpm, cpu_state[1].rpm)
754 BUILD_SHOW_FUNC_INT(cpu1_intake_fan_rpm, cpu_state[1].intake_rpm)
755
756 BUILD_SHOW_FUNC_FIX(backside_temperature, backside_state.last_temp)
757 BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm)
758
759 BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp)
760 BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm)
761
762 BUILD_SHOW_FUNC_FIX(slots_temperature, slots_state.last_temp)
763 BUILD_SHOW_FUNC_INT(slots_fan_pwm, slots_state.pwm)
764
765 BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp)
766
767 static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL);
768 static DEVICE_ATTR(cpu0_voltage,S_IRUGO,show_cpu0_voltage,NULL);
769 static DEVICE_ATTR(cpu0_current,S_IRUGO,show_cpu0_current,NULL);
770 static DEVICE_ATTR(cpu0_exhaust_fan_rpm,S_IRUGO,show_cpu0_exhaust_fan_rpm,NULL);
771 static DEVICE_ATTR(cpu0_intake_fan_rpm,S_IRUGO,show_cpu0_intake_fan_rpm,NULL);
772
773 static DEVICE_ATTR(cpu1_temperature,S_IRUGO,show_cpu1_temperature,NULL);
774 static DEVICE_ATTR(cpu1_voltage,S_IRUGO,show_cpu1_voltage,NULL);
775 static DEVICE_ATTR(cpu1_current,S_IRUGO,show_cpu1_current,NULL);
776 static DEVICE_ATTR(cpu1_exhaust_fan_rpm,S_IRUGO,show_cpu1_exhaust_fan_rpm,NULL);
777 static DEVICE_ATTR(cpu1_intake_fan_rpm,S_IRUGO,show_cpu1_intake_fan_rpm,NULL);
778
779 static DEVICE_ATTR(backside_temperature,S_IRUGO,show_backside_temperature,NULL);
780 static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL);
781
782 static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL);
783 static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL);
784
785 static DEVICE_ATTR(slots_temperature,S_IRUGO,show_slots_temperature,NULL);
786 static DEVICE_ATTR(slots_fan_pwm,S_IRUGO,show_slots_fan_pwm,NULL);
787
788 static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL);
789
790 /*
791 * CPUs fans control loop
792 */
793
794 static int do_read_one_cpu_values(struct cpu_pid_state *state, s32 *temp, s32 *power)
795 {
796 s32 ltemp, volts, amps;
797 int index, rc = 0;
798
799 /* Default (in case of error) */
800 *temp = state->cur_temp;
801 *power = state->cur_power;
802
803 if (cpu_pid_type == CPU_PID_TYPE_RACKMAC)
804 index = (state->index == 0) ?
805 CPU_A1_FAN_RPM_INDEX : CPU_B1_FAN_RPM_INDEX;
806 else
807 index = (state->index == 0) ?
808 CPUA_EXHAUST_FAN_RPM_INDEX : CPUB_EXHAUST_FAN_RPM_INDEX;
809
810 /* Read current fan status */
811 rc = get_rpm_fan(index, !RPM_PID_USE_ACTUAL_SPEED);
812 if (rc < 0) {
813 /* XXX What do we do now ? Nothing for now, keep old value, but
814 * return error upstream
815 */
816 DBG(" cpu %d, fan reading error !\n", state->index);
817 } else {
818 state->rpm = rc;
819 DBG(" cpu %d, exhaust RPM: %d\n", state->index, state->rpm);
820 }
821
822 /* Get some sensor readings and scale it */
823 ltemp = read_smon_adc(state, 1);
824 if (ltemp == -1) {
825 /* XXX What do we do now ? */
826 state->overtemp++;
827 if (rc == 0)
828 rc = -EIO;
829 DBG(" cpu %d, temp reading error !\n", state->index);
830 } else {
831 /* Fixup temperature according to diode calibration
832 */
833 DBG(" cpu %d, temp raw: %04x, m_diode: %04x, b_diode: %04x\n",
834 state->index,
835 ltemp, state->mpu.mdiode, state->mpu.bdiode);
836 *temp = ((s32)ltemp * (s32)state->mpu.mdiode + ((s32)state->mpu.bdiode << 12)) >> 2;
837 state->last_temp = *temp;
838 DBG(" temp: %d.%03d\n", FIX32TOPRINT((*temp)));
839 }
840
841 /*
842 * Read voltage & current and calculate power
843 */
844 volts = read_smon_adc(state, 3);
845 amps = read_smon_adc(state, 4);
846
847 /* Scale voltage and current raw sensor values according to fixed scales
848 * obtained in Darwin and calculate power from I and V
849 */
850 volts *= ADC_CPU_VOLTAGE_SCALE;
851 amps *= ADC_CPU_CURRENT_SCALE;
852 *power = (((u64)volts) * ((u64)amps)) >> 16;
853 state->voltage = volts;
854 state->current_a = amps;
855 state->last_power = *power;
856
857 DBG(" cpu %d, current: %d.%03d, voltage: %d.%03d, power: %d.%03d W\n",
858 state->index, FIX32TOPRINT(state->current_a),
859 FIX32TOPRINT(state->voltage), FIX32TOPRINT(*power));
860
861 return 0;
862 }
863
864 static void do_cpu_pid(struct cpu_pid_state *state, s32 temp, s32 power)
865 {
866 s32 power_target, integral, derivative, proportional, adj_in_target, sval;
867 s64 integ_p, deriv_p, prop_p, sum;
868 int i;
869
870 /* Calculate power target value (could be done once for all)
871 * and convert to a 16.16 fp number
872 */
873 power_target = ((u32)(state->mpu.pmaxh - state->mpu.padjmax)) << 16;
874 DBG(" power target: %d.%03d, error: %d.%03d\n",
875 FIX32TOPRINT(power_target), FIX32TOPRINT(power_target - power));
876
877 /* Store temperature and power in history array */
878 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
879 state->temp_history[state->cur_temp] = temp;
880 state->cur_power = (state->cur_power + 1) % state->count_power;
881 state->power_history[state->cur_power] = power;
882 state->error_history[state->cur_power] = power_target - power;
883
884 /* If first loop, fill the history table */
885 if (state->first) {
886 for (i = 0; i < (state->count_power - 1); i++) {
887 state->cur_power = (state->cur_power + 1) % state->count_power;
888 state->power_history[state->cur_power] = power;
889 state->error_history[state->cur_power] = power_target - power;
890 }
891 for (i = 0; i < (CPU_TEMP_HISTORY_SIZE - 1); i++) {
892 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
893 state->temp_history[state->cur_temp] = temp;
894 }
895 state->first = 0;
896 }
897
898 /* Calculate the integral term normally based on the "power" values */
899 sum = 0;
900 integral = 0;
901 for (i = 0; i < state->count_power; i++)
902 integral += state->error_history[i];
903 integral *= CPU_PID_INTERVAL;
904 DBG(" integral: %08x\n", integral);
905
906 /* Calculate the adjusted input (sense value).
907 * G_r is 12.20
908 * integ is 16.16
909 * so the result is 28.36
910 *
911 * input target is mpu.ttarget, input max is mpu.tmax
912 */
913 integ_p = ((s64)state->mpu.pid_gr) * (s64)integral;
914 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
915 sval = (state->mpu.tmax << 16) - ((integ_p >> 20) & 0xffffffff);
916 adj_in_target = (state->mpu.ttarget << 16);
917 if (adj_in_target > sval)
918 adj_in_target = sval;
919 DBG(" adj_in_target: %d.%03d, ttarget: %d\n", FIX32TOPRINT(adj_in_target),
920 state->mpu.ttarget);
921
922 /* Calculate the derivative term */
923 derivative = state->temp_history[state->cur_temp] -
924 state->temp_history[(state->cur_temp + CPU_TEMP_HISTORY_SIZE - 1)
925 % CPU_TEMP_HISTORY_SIZE];
926 derivative /= CPU_PID_INTERVAL;
927 deriv_p = ((s64)state->mpu.pid_gd) * (s64)derivative;
928 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
929 sum += deriv_p;
930
931 /* Calculate the proportional term */
932 proportional = temp - adj_in_target;
933 prop_p = ((s64)state->mpu.pid_gp) * (s64)proportional;
934 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
935 sum += prop_p;
936
937 /* Scale sum */
938 sum >>= 36;
939
940 DBG(" sum: %d\n", (int)sum);
941 state->rpm += (s32)sum;
942 }
943
944 static void do_monitor_cpu_combined(void)
945 {
946 struct cpu_pid_state *state0 = &cpu_state[0];
947 struct cpu_pid_state *state1 = &cpu_state[1];
948 s32 temp0, power0, temp1, power1;
949 s32 temp_combi, power_combi;
950 int rc, intake, pump;
951
952 rc = do_read_one_cpu_values(state0, &temp0, &power0);
953 if (rc < 0) {
954 /* XXX What do we do now ? */
955 }
956 state1->overtemp = 0;
957 rc = do_read_one_cpu_values(state1, &temp1, &power1);
958 if (rc < 0) {
959 /* XXX What do we do now ? */
960 }
961 if (state1->overtemp)
962 state0->overtemp++;
963
964 temp_combi = max(temp0, temp1);
965 power_combi = max(power0, power1);
966
967 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
968 * full blown immediately and try to trigger a shutdown
969 */
970 if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) {
971 printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n",
972 temp_combi >> 16);
973 state0->overtemp += CPU_MAX_OVERTEMP / 4;
974 } else if (temp_combi > (state0->mpu.tmax << 16))
975 state0->overtemp++;
976 else
977 state0->overtemp = 0;
978 if (state0->overtemp >= CPU_MAX_OVERTEMP)
979 critical_state = 1;
980 if (state0->overtemp > 0) {
981 state0->rpm = state0->mpu.rmaxn_exhaust_fan;
982 state0->intake_rpm = intake = state0->mpu.rmaxn_intake_fan;
983 pump = state0->pump_max;
984 goto do_set_fans;
985 }
986
987 /* Do the PID */
988 do_cpu_pid(state0, temp_combi, power_combi);
989
990 /* Range check */
991 state0->rpm = max(state0->rpm, (int)state0->mpu.rminn_exhaust_fan);
992 state0->rpm = min(state0->rpm, (int)state0->mpu.rmaxn_exhaust_fan);
993
994 /* Calculate intake fan speed */
995 intake = (state0->rpm * CPU_INTAKE_SCALE) >> 16;
996 intake = max(intake, (int)state0->mpu.rminn_intake_fan);
997 intake = min(intake, (int)state0->mpu.rmaxn_intake_fan);
998 state0->intake_rpm = intake;
999
1000 /* Calculate pump speed */
1001 pump = (state0->rpm * state0->pump_max) /
1002 state0->mpu.rmaxn_exhaust_fan;
1003 pump = min(pump, state0->pump_max);
1004 pump = max(pump, state0->pump_min);
1005
1006 do_set_fans:
1007 /* We copy values from state 0 to state 1 for /sysfs */
1008 state1->rpm = state0->rpm;
1009 state1->intake_rpm = state0->intake_rpm;
1010
1011 DBG("** CPU %d RPM: %d Ex, %d, Pump: %d, In, overtemp: %d\n",
1012 state1->index, (int)state1->rpm, intake, pump, state1->overtemp);
1013
1014 /* We should check for errors, shouldn't we ? But then, what
1015 * do we do once the error occurs ? For FCU notified fan
1016 * failures (-EFAULT) we probably want to notify userland
1017 * some way...
1018 */
1019 set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake);
1020 set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state0->rpm);
1021 set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake);
1022 set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state0->rpm);
1023
1024 if (fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID)
1025 set_rpm_fan(CPUA_PUMP_RPM_INDEX, pump);
1026 if (fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID)
1027 set_rpm_fan(CPUB_PUMP_RPM_INDEX, pump);
1028 }
1029
1030 static void do_monitor_cpu_split(struct cpu_pid_state *state)
1031 {
1032 s32 temp, power;
1033 int rc, intake;
1034
1035 /* Read current fan status */
1036 rc = do_read_one_cpu_values(state, &temp, &power);
1037 if (rc < 0) {
1038 /* XXX What do we do now ? */
1039 }
1040
1041 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
1042 * full blown immediately and try to trigger a shutdown
1043 */
1044 if (temp >= ((state->mpu.tmax + 8) << 16)) {
1045 printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
1046 " (%d) !\n",
1047 state->index, temp >> 16);
1048 state->overtemp += CPU_MAX_OVERTEMP / 4;
1049 } else if (temp > (state->mpu.tmax << 16))
1050 state->overtemp++;
1051 else
1052 state->overtemp = 0;
1053 if (state->overtemp >= CPU_MAX_OVERTEMP)
1054 critical_state = 1;
1055 if (state->overtemp > 0) {
1056 state->rpm = state->mpu.rmaxn_exhaust_fan;
1057 state->intake_rpm = intake = state->mpu.rmaxn_intake_fan;
1058 goto do_set_fans;
1059 }
1060
1061 /* Do the PID */
1062 do_cpu_pid(state, temp, power);
1063
1064 /* Range check */
1065 state->rpm = max(state->rpm, (int)state->mpu.rminn_exhaust_fan);
1066 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_exhaust_fan);
1067
1068 /* Calculate intake fan */
1069 intake = (state->rpm * CPU_INTAKE_SCALE) >> 16;
1070 intake = max(intake, (int)state->mpu.rminn_intake_fan);
1071 intake = min(intake, (int)state->mpu.rmaxn_intake_fan);
1072 state->intake_rpm = intake;
1073
1074 do_set_fans:
1075 DBG("** CPU %d RPM: %d Ex, %d In, overtemp: %d\n",
1076 state->index, (int)state->rpm, intake, state->overtemp);
1077
1078 /* We should check for errors, shouldn't we ? But then, what
1079 * do we do once the error occurs ? For FCU notified fan
1080 * failures (-EFAULT) we probably want to notify userland
1081 * some way...
1082 */
1083 if (state->index == 0) {
1084 set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake);
1085 set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state->rpm);
1086 } else {
1087 set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake);
1088 set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state->rpm);
1089 }
1090 }
1091
1092 static void do_monitor_cpu_rack(struct cpu_pid_state *state)
1093 {
1094 s32 temp, power, fan_min;
1095 int rc;
1096
1097 /* Read current fan status */
1098 rc = do_read_one_cpu_values(state, &temp, &power);
1099 if (rc < 0) {
1100 /* XXX What do we do now ? */
1101 }
1102
1103 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
1104 * full blown immediately and try to trigger a shutdown
1105 */
1106 if (temp >= ((state->mpu.tmax + 8) << 16)) {
1107 printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
1108 " (%d) !\n",
1109 state->index, temp >> 16);
1110 state->overtemp = CPU_MAX_OVERTEMP / 4;
1111 } else if (temp > (state->mpu.tmax << 16))
1112 state->overtemp++;
1113 else
1114 state->overtemp = 0;
1115 if (state->overtemp >= CPU_MAX_OVERTEMP)
1116 critical_state = 1;
1117 if (state->overtemp > 0) {
1118 state->rpm = state->intake_rpm = state->mpu.rmaxn_intake_fan;
1119 goto do_set_fans;
1120 }
1121
1122 /* Do the PID */
1123 do_cpu_pid(state, temp, power);
1124
1125 /* Check clamp from dimms */
1126 fan_min = dimm_output_clamp;
1127 fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan);
1128
1129 DBG(" CPU min mpu = %d, min dimm = %d\n",
1130 state->mpu.rminn_intake_fan, dimm_output_clamp);
1131
1132 state->rpm = max(state->rpm, (int)fan_min);
1133 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan);
1134 state->intake_rpm = state->rpm;
1135
1136 do_set_fans:
1137 DBG("** CPU %d RPM: %d overtemp: %d\n",
1138 state->index, (int)state->rpm, state->overtemp);
1139
1140 /* We should check for errors, shouldn't we ? But then, what
1141 * do we do once the error occurs ? For FCU notified fan
1142 * failures (-EFAULT) we probably want to notify userland
1143 * some way...
1144 */
1145 if (state->index == 0) {
1146 set_rpm_fan(CPU_A1_FAN_RPM_INDEX, state->rpm);
1147 set_rpm_fan(CPU_A2_FAN_RPM_INDEX, state->rpm);
1148 set_rpm_fan(CPU_A3_FAN_RPM_INDEX, state->rpm);
1149 } else {
1150 set_rpm_fan(CPU_B1_FAN_RPM_INDEX, state->rpm);
1151 set_rpm_fan(CPU_B2_FAN_RPM_INDEX, state->rpm);
1152 set_rpm_fan(CPU_B3_FAN_RPM_INDEX, state->rpm);
1153 }
1154 }
1155
1156 /*
1157 * Initialize the state structure for one CPU control loop
1158 */
1159 static int init_cpu_state(struct cpu_pid_state *state, int index)
1160 {
1161 state->index = index;
1162 state->first = 1;
1163 state->rpm = (cpu_pid_type == CPU_PID_TYPE_RACKMAC) ? 4000 : 1000;
1164 state->overtemp = 0;
1165 state->adc_config = 0x00;
1166
1167
1168 if (index == 0)
1169 state->monitor = attach_i2c_chip(SUPPLY_MONITOR_ID, "CPU0_monitor");
1170 else if (index == 1)
1171 state->monitor = attach_i2c_chip(SUPPLY_MONITORB_ID, "CPU1_monitor");
1172 if (state->monitor == NULL)
1173 goto fail;
1174
1175 if (read_eeprom(index, &state->mpu))
1176 goto fail;
1177
1178 state->count_power = state->mpu.tguardband;
1179 if (state->count_power > CPU_POWER_HISTORY_SIZE) {
1180 printk(KERN_WARNING "Warning ! too many power history slots\n");
1181 state->count_power = CPU_POWER_HISTORY_SIZE;
1182 }
1183 DBG("CPU %d Using %d power history entries\n", index, state->count_power);
1184
1185 if (index == 0) {
1186 device_create_file(&of_dev->dev, &dev_attr_cpu0_temperature);
1187 device_create_file(&of_dev->dev, &dev_attr_cpu0_voltage);
1188 device_create_file(&of_dev->dev, &dev_attr_cpu0_current);
1189 device_create_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm);
1190 device_create_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm);
1191 } else {
1192 device_create_file(&of_dev->dev, &dev_attr_cpu1_temperature);
1193 device_create_file(&of_dev->dev, &dev_attr_cpu1_voltage);
1194 device_create_file(&of_dev->dev, &dev_attr_cpu1_current);
1195 device_create_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm);
1196 device_create_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm);
1197 }
1198
1199 return 0;
1200 fail:
1201 if (state->monitor)
1202 detach_i2c_chip(state->monitor);
1203 state->monitor = NULL;
1204
1205 return -ENODEV;
1206 }
1207
1208 /*
1209 * Dispose of the state data for one CPU control loop
1210 */
1211 static void dispose_cpu_state(struct cpu_pid_state *state)
1212 {
1213 if (state->monitor == NULL)
1214 return;
1215
1216 if (state->index == 0) {
1217 device_remove_file(&of_dev->dev, &dev_attr_cpu0_temperature);
1218 device_remove_file(&of_dev->dev, &dev_attr_cpu0_voltage);
1219 device_remove_file(&of_dev->dev, &dev_attr_cpu0_current);
1220 device_remove_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm);
1221 device_remove_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm);
1222 } else {
1223 device_remove_file(&of_dev->dev, &dev_attr_cpu1_temperature);
1224 device_remove_file(&of_dev->dev, &dev_attr_cpu1_voltage);
1225 device_remove_file(&of_dev->dev, &dev_attr_cpu1_current);
1226 device_remove_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm);
1227 device_remove_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm);
1228 }
1229
1230 detach_i2c_chip(state->monitor);
1231 state->monitor = NULL;
1232 }
1233
1234 /*
1235 * Motherboard backside & U3 heatsink fan control loop
1236 */
1237 static void do_monitor_backside(struct backside_pid_state *state)
1238 {
1239 s32 temp, integral, derivative, fan_min;
1240 s64 integ_p, deriv_p, prop_p, sum;
1241 int i, rc;
1242
1243 if (--state->ticks != 0)
1244 return;
1245 state->ticks = backside_params.interval;
1246
1247 DBG("backside:\n");
1248
1249 /* Check fan status */
1250 rc = get_pwm_fan(BACKSIDE_FAN_PWM_INDEX);
1251 if (rc < 0) {
1252 printk(KERN_WARNING "Error %d reading backside fan !\n", rc);
1253 /* XXX What do we do now ? */
1254 } else
1255 state->pwm = rc;
1256 DBG(" current pwm: %d\n", state->pwm);
1257
1258 /* Get some sensor readings */
1259 temp = i2c_smbus_read_byte_data(state->monitor, MAX6690_EXT_TEMP) << 16;
1260 state->last_temp = temp;
1261 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1262 FIX32TOPRINT(backside_params.input_target));
1263
1264 /* Store temperature and error in history array */
1265 state->cur_sample = (state->cur_sample + 1) % BACKSIDE_PID_HISTORY_SIZE;
1266 state->sample_history[state->cur_sample] = temp;
1267 state->error_history[state->cur_sample] = temp - backside_params.input_target;
1268
1269 /* If first loop, fill the history table */
1270 if (state->first) {
1271 for (i = 0; i < (BACKSIDE_PID_HISTORY_SIZE - 1); i++) {
1272 state->cur_sample = (state->cur_sample + 1) %
1273 BACKSIDE_PID_HISTORY_SIZE;
1274 state->sample_history[state->cur_sample] = temp;
1275 state->error_history[state->cur_sample] =
1276 temp - backside_params.input_target;
1277 }
1278 state->first = 0;
1279 }
1280
1281 /* Calculate the integral term */
1282 sum = 0;
1283 integral = 0;
1284 for (i = 0; i < BACKSIDE_PID_HISTORY_SIZE; i++)
1285 integral += state->error_history[i];
1286 integral *= backside_params.interval;
1287 DBG(" integral: %08x\n", integral);
1288 integ_p = ((s64)backside_params.G_r) * (s64)integral;
1289 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1290 sum += integ_p;
1291
1292 /* Calculate the derivative term */
1293 derivative = state->error_history[state->cur_sample] -
1294 state->error_history[(state->cur_sample + BACKSIDE_PID_HISTORY_SIZE - 1)
1295 % BACKSIDE_PID_HISTORY_SIZE];
1296 derivative /= backside_params.interval;
1297 deriv_p = ((s64)backside_params.G_d) * (s64)derivative;
1298 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1299 sum += deriv_p;
1300
1301 /* Calculate the proportional term */
1302 prop_p = ((s64)backside_params.G_p) * (s64)(state->error_history[state->cur_sample]);
1303 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1304 sum += prop_p;
1305
1306 /* Scale sum */
1307 sum >>= 36;
1308
1309 DBG(" sum: %d\n", (int)sum);
1310 if (backside_params.additive)
1311 state->pwm += (s32)sum;
1312 else
1313 state->pwm = sum;
1314
1315 /* Check for clamp */
1316 fan_min = (dimm_output_clamp * 100) / 14000;
1317 fan_min = max(fan_min, backside_params.output_min);
1318
1319 state->pwm = max(state->pwm, fan_min);
1320 state->pwm = min(state->pwm, backside_params.output_max);
1321
1322 DBG("** BACKSIDE PWM: %d\n", (int)state->pwm);
1323 set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, state->pwm);
1324 }
1325
1326 /*
1327 * Initialize the state structure for the backside fan control loop
1328 */
1329 static int init_backside_state(struct backside_pid_state *state)
1330 {
1331 struct device_node *u3;
1332 int u3h = 1; /* conservative by default */
1333
1334 /*
1335 * There are different PID params for machines with U3 and machines
1336 * with U3H, pick the right ones now
1337 */
1338 u3 = of_find_node_by_path("/u3@0,f8000000");
1339 if (u3 != NULL) {
1340 const u32 *vers = of_get_property(u3, "device-rev", NULL);
1341 if (vers)
1342 if (((*vers) & 0x3f) < 0x34)
1343 u3h = 0;
1344 of_node_put(u3);
1345 }
1346
1347 if (rackmac) {
1348 backside_params.G_d = BACKSIDE_PID_RACK_G_d;
1349 backside_params.input_target = BACKSIDE_PID_RACK_INPUT_TARGET;
1350 backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN;
1351 backside_params.interval = BACKSIDE_PID_RACK_INTERVAL;
1352 backside_params.G_p = BACKSIDE_PID_RACK_G_p;
1353 backside_params.G_r = BACKSIDE_PID_G_r;
1354 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1355 backside_params.additive = 0;
1356 } else if (u3h) {
1357 backside_params.G_d = BACKSIDE_PID_U3H_G_d;
1358 backside_params.input_target = BACKSIDE_PID_U3H_INPUT_TARGET;
1359 backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN;
1360 backside_params.interval = BACKSIDE_PID_INTERVAL;
1361 backside_params.G_p = BACKSIDE_PID_G_p;
1362 backside_params.G_r = BACKSIDE_PID_G_r;
1363 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1364 backside_params.additive = 1;
1365 } else {
1366 backside_params.G_d = BACKSIDE_PID_U3_G_d;
1367 backside_params.input_target = BACKSIDE_PID_U3_INPUT_TARGET;
1368 backside_params.output_min = BACKSIDE_PID_U3_OUTPUT_MIN;
1369 backside_params.interval = BACKSIDE_PID_INTERVAL;
1370 backside_params.G_p = BACKSIDE_PID_G_p;
1371 backside_params.G_r = BACKSIDE_PID_G_r;
1372 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1373 backside_params.additive = 1;
1374 }
1375
1376 state->ticks = 1;
1377 state->first = 1;
1378 state->pwm = 50;
1379
1380 state->monitor = attach_i2c_chip(BACKSIDE_MAX_ID, "backside_temp");
1381 if (state->monitor == NULL)
1382 return -ENODEV;
1383
1384 device_create_file(&of_dev->dev, &dev_attr_backside_temperature);
1385 device_create_file(&of_dev->dev, &dev_attr_backside_fan_pwm);
1386
1387 return 0;
1388 }
1389
1390 /*
1391 * Dispose of the state data for the backside control loop
1392 */
1393 static void dispose_backside_state(struct backside_pid_state *state)
1394 {
1395 if (state->monitor == NULL)
1396 return;
1397
1398 device_remove_file(&of_dev->dev, &dev_attr_backside_temperature);
1399 device_remove_file(&of_dev->dev, &dev_attr_backside_fan_pwm);
1400
1401 detach_i2c_chip(state->monitor);
1402 state->monitor = NULL;
1403 }
1404
1405 /*
1406 * Drives bay fan control loop
1407 */
1408 static void do_monitor_drives(struct drives_pid_state *state)
1409 {
1410 s32 temp, integral, derivative;
1411 s64 integ_p, deriv_p, prop_p, sum;
1412 int i, rc;
1413
1414 if (--state->ticks != 0)
1415 return;
1416 state->ticks = DRIVES_PID_INTERVAL;
1417
1418 DBG("drives:\n");
1419
1420 /* Check fan status */
1421 rc = get_rpm_fan(DRIVES_FAN_RPM_INDEX, !RPM_PID_USE_ACTUAL_SPEED);
1422 if (rc < 0) {
1423 printk(KERN_WARNING "Error %d reading drives fan !\n", rc);
1424 /* XXX What do we do now ? */
1425 } else
1426 state->rpm = rc;
1427 DBG(" current rpm: %d\n", state->rpm);
1428
1429 /* Get some sensor readings */
1430 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
1431 DS1775_TEMP)) << 8;
1432 state->last_temp = temp;
1433 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1434 FIX32TOPRINT(DRIVES_PID_INPUT_TARGET));
1435
1436 /* Store temperature and error in history array */
1437 state->cur_sample = (state->cur_sample + 1) % DRIVES_PID_HISTORY_SIZE;
1438 state->sample_history[state->cur_sample] = temp;
1439 state->error_history[state->cur_sample] = temp - DRIVES_PID_INPUT_TARGET;
1440
1441 /* If first loop, fill the history table */
1442 if (state->first) {
1443 for (i = 0; i < (DRIVES_PID_HISTORY_SIZE - 1); i++) {
1444 state->cur_sample = (state->cur_sample + 1) %
1445 DRIVES_PID_HISTORY_SIZE;
1446 state->sample_history[state->cur_sample] = temp;
1447 state->error_history[state->cur_sample] =
1448 temp - DRIVES_PID_INPUT_TARGET;
1449 }
1450 state->first = 0;
1451 }
1452
1453 /* Calculate the integral term */
1454 sum = 0;
1455 integral = 0;
1456 for (i = 0; i < DRIVES_PID_HISTORY_SIZE; i++)
1457 integral += state->error_history[i];
1458 integral *= DRIVES_PID_INTERVAL;
1459 DBG(" integral: %08x\n", integral);
1460 integ_p = ((s64)DRIVES_PID_G_r) * (s64)integral;
1461 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1462 sum += integ_p;
1463
1464 /* Calculate the derivative term */
1465 derivative = state->error_history[state->cur_sample] -
1466 state->error_history[(state->cur_sample + DRIVES_PID_HISTORY_SIZE - 1)
1467 % DRIVES_PID_HISTORY_SIZE];
1468 derivative /= DRIVES_PID_INTERVAL;
1469 deriv_p = ((s64)DRIVES_PID_G_d) * (s64)derivative;
1470 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1471 sum += deriv_p;
1472
1473 /* Calculate the proportional term */
1474 prop_p = ((s64)DRIVES_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1475 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1476 sum += prop_p;
1477
1478 /* Scale sum */
1479 sum >>= 36;
1480
1481 DBG(" sum: %d\n", (int)sum);
1482 state->rpm += (s32)sum;
1483
1484 state->rpm = max(state->rpm, DRIVES_PID_OUTPUT_MIN);
1485 state->rpm = min(state->rpm, DRIVES_PID_OUTPUT_MAX);
1486
1487 DBG("** DRIVES RPM: %d\n", (int)state->rpm);
1488 set_rpm_fan(DRIVES_FAN_RPM_INDEX, state->rpm);
1489 }
1490
1491 /*
1492 * Initialize the state structure for the drives bay fan control loop
1493 */
1494 static int init_drives_state(struct drives_pid_state *state)
1495 {
1496 state->ticks = 1;
1497 state->first = 1;
1498 state->rpm = 1000;
1499
1500 state->monitor = attach_i2c_chip(DRIVES_DALLAS_ID, "drives_temp");
1501 if (state->monitor == NULL)
1502 return -ENODEV;
1503
1504 device_create_file(&of_dev->dev, &dev_attr_drives_temperature);
1505 device_create_file(&of_dev->dev, &dev_attr_drives_fan_rpm);
1506
1507 return 0;
1508 }
1509
1510 /*
1511 * Dispose of the state data for the drives control loop
1512 */
1513 static void dispose_drives_state(struct drives_pid_state *state)
1514 {
1515 if (state->monitor == NULL)
1516 return;
1517
1518 device_remove_file(&of_dev->dev, &dev_attr_drives_temperature);
1519 device_remove_file(&of_dev->dev, &dev_attr_drives_fan_rpm);
1520
1521 detach_i2c_chip(state->monitor);
1522 state->monitor = NULL;
1523 }
1524
1525 /*
1526 * DIMMs temp control loop
1527 */
1528 static void do_monitor_dimms(struct dimm_pid_state *state)
1529 {
1530 s32 temp, integral, derivative, fan_min;
1531 s64 integ_p, deriv_p, prop_p, sum;
1532 int i;
1533
1534 if (--state->ticks != 0)
1535 return;
1536 state->ticks = DIMM_PID_INTERVAL;
1537
1538 DBG("DIMM:\n");
1539
1540 DBG(" current value: %d\n", state->output);
1541
1542 temp = read_lm87_reg(state->monitor, LM87_INT_TEMP);
1543 if (temp < 0)
1544 return;
1545 temp <<= 16;
1546 state->last_temp = temp;
1547 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1548 FIX32TOPRINT(DIMM_PID_INPUT_TARGET));
1549
1550 /* Store temperature and error in history array */
1551 state->cur_sample = (state->cur_sample + 1) % DIMM_PID_HISTORY_SIZE;
1552 state->sample_history[state->cur_sample] = temp;
1553 state->error_history[state->cur_sample] = temp - DIMM_PID_INPUT_TARGET;
1554
1555 /* If first loop, fill the history table */
1556 if (state->first) {
1557 for (i = 0; i < (DIMM_PID_HISTORY_SIZE - 1); i++) {
1558 state->cur_sample = (state->cur_sample + 1) %
1559 DIMM_PID_HISTORY_SIZE;
1560 state->sample_history[state->cur_sample] = temp;
1561 state->error_history[state->cur_sample] =
1562 temp - DIMM_PID_INPUT_TARGET;
1563 }
1564 state->first = 0;
1565 }
1566
1567 /* Calculate the integral term */
1568 sum = 0;
1569 integral = 0;
1570 for (i = 0; i < DIMM_PID_HISTORY_SIZE; i++)
1571 integral += state->error_history[i];
1572 integral *= DIMM_PID_INTERVAL;
1573 DBG(" integral: %08x\n", integral);
1574 integ_p = ((s64)DIMM_PID_G_r) * (s64)integral;
1575 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1576 sum += integ_p;
1577
1578 /* Calculate the derivative term */
1579 derivative = state->error_history[state->cur_sample] -
1580 state->error_history[(state->cur_sample + DIMM_PID_HISTORY_SIZE - 1)
1581 % DIMM_PID_HISTORY_SIZE];
1582 derivative /= DIMM_PID_INTERVAL;
1583 deriv_p = ((s64)DIMM_PID_G_d) * (s64)derivative;
1584 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1585 sum += deriv_p;
1586
1587 /* Calculate the proportional term */
1588 prop_p = ((s64)DIMM_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1589 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1590 sum += prop_p;
1591
1592 /* Scale sum */
1593 sum >>= 36;
1594
1595 DBG(" sum: %d\n", (int)sum);
1596 state->output = (s32)sum;
1597 state->output = max(state->output, DIMM_PID_OUTPUT_MIN);
1598 state->output = min(state->output, DIMM_PID_OUTPUT_MAX);
1599 dimm_output_clamp = state->output;
1600
1601 DBG("** DIMM clamp value: %d\n", (int)state->output);
1602
1603 /* Backside PID is only every 5 seconds, force backside fan clamping now */
1604 fan_min = (dimm_output_clamp * 100) / 14000;
1605 fan_min = max(fan_min, backside_params.output_min);
1606 if (backside_state.pwm < fan_min) {
1607 backside_state.pwm = fan_min;
1608 DBG(" -> applying clamp to backside fan now: %d !\n", fan_min);
1609 set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, fan_min);
1610 }
1611 }
1612
1613 /*
1614 * Initialize the state structure for the DIMM temp control loop
1615 */
1616 static int init_dimms_state(struct dimm_pid_state *state)
1617 {
1618 state->ticks = 1;
1619 state->first = 1;
1620 state->output = 4000;
1621
1622 state->monitor = attach_i2c_chip(XSERVE_DIMMS_LM87, "dimms_temp");
1623 if (state->monitor == NULL)
1624 return -ENODEV;
1625
1626 device_create_file(&of_dev->dev, &dev_attr_dimms_temperature);
1627
1628 return 0;
1629 }
1630
1631 /*
1632 * Dispose of the state data for the DIMM control loop
1633 */
1634 static void dispose_dimms_state(struct dimm_pid_state *state)
1635 {
1636 if (state->monitor == NULL)
1637 return;
1638
1639 device_remove_file(&of_dev->dev, &dev_attr_dimms_temperature);
1640
1641 detach_i2c_chip(state->monitor);
1642 state->monitor = NULL;
1643 }
1644
1645 /*
1646 * Slots fan control loop
1647 */
1648 static void do_monitor_slots(struct slots_pid_state *state)
1649 {
1650 s32 temp, integral, derivative;
1651 s64 integ_p, deriv_p, prop_p, sum;
1652 int i, rc;
1653
1654 if (--state->ticks != 0)
1655 return;
1656 state->ticks = SLOTS_PID_INTERVAL;
1657
1658 DBG("slots:\n");
1659
1660 /* Check fan status */
1661 rc = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
1662 if (rc < 0) {
1663 printk(KERN_WARNING "Error %d reading slots fan !\n", rc);
1664 /* XXX What do we do now ? */
1665 } else
1666 state->pwm = rc;
1667 DBG(" current pwm: %d\n", state->pwm);
1668
1669 /* Get some sensor readings */
1670 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
1671 DS1775_TEMP)) << 8;
1672 state->last_temp = temp;
1673 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1674 FIX32TOPRINT(SLOTS_PID_INPUT_TARGET));
1675
1676 /* Store temperature and error in history array */
1677 state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE;
1678 state->sample_history[state->cur_sample] = temp;
1679 state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET;
1680
1681 /* If first loop, fill the history table */
1682 if (state->first) {
1683 for (i = 0; i < (SLOTS_PID_HISTORY_SIZE - 1); i++) {
1684 state->cur_sample = (state->cur_sample + 1) %
1685 SLOTS_PID_HISTORY_SIZE;
1686 state->sample_history[state->cur_sample] = temp;
1687 state->error_history[state->cur_sample] =
1688 temp - SLOTS_PID_INPUT_TARGET;
1689 }
1690 state->first = 0;
1691 }
1692
1693 /* Calculate the integral term */
1694 sum = 0;
1695 integral = 0;
1696 for (i = 0; i < SLOTS_PID_HISTORY_SIZE; i++)
1697 integral += state->error_history[i];
1698 integral *= SLOTS_PID_INTERVAL;
1699 DBG(" integral: %08x\n", integral);
1700 integ_p = ((s64)SLOTS_PID_G_r) * (s64)integral;
1701 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1702 sum += integ_p;
1703
1704 /* Calculate the derivative term */
1705 derivative = state->error_history[state->cur_sample] -
1706 state->error_history[(state->cur_sample + SLOTS_PID_HISTORY_SIZE - 1)
1707 % SLOTS_PID_HISTORY_SIZE];
1708 derivative /= SLOTS_PID_INTERVAL;
1709 deriv_p = ((s64)SLOTS_PID_G_d) * (s64)derivative;
1710 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1711 sum += deriv_p;
1712
1713 /* Calculate the proportional term */
1714 prop_p = ((s64)SLOTS_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1715 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1716 sum += prop_p;
1717
1718 /* Scale sum */
1719 sum >>= 36;
1720
1721 DBG(" sum: %d\n", (int)sum);
1722 state->pwm = (s32)sum;
1723
1724 state->pwm = max(state->pwm, SLOTS_PID_OUTPUT_MIN);
1725 state->pwm = min(state->pwm, SLOTS_PID_OUTPUT_MAX);
1726
1727 DBG("** DRIVES PWM: %d\n", (int)state->pwm);
1728 set_pwm_fan(SLOTS_FAN_PWM_INDEX, state->pwm);
1729 }
1730
1731 /*
1732 * Initialize the state structure for the slots bay fan control loop
1733 */
1734 static int init_slots_state(struct slots_pid_state *state)
1735 {
1736 state->ticks = 1;
1737 state->first = 1;
1738 state->pwm = 50;
1739
1740 state->monitor = attach_i2c_chip(XSERVE_SLOTS_LM75, "slots_temp");
1741 if (state->monitor == NULL)
1742 return -ENODEV;
1743
1744 device_create_file(&of_dev->dev, &dev_attr_slots_temperature);
1745 device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
1746
1747 return 0;
1748 }
1749
1750 /*
1751 * Dispose of the state data for the slots control loop
1752 */
1753 static void dispose_slots_state(struct slots_pid_state *state)
1754 {
1755 if (state->monitor == NULL)
1756 return;
1757
1758 device_remove_file(&of_dev->dev, &dev_attr_slots_temperature);
1759 device_remove_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
1760
1761 detach_i2c_chip(state->monitor);
1762 state->monitor = NULL;
1763 }
1764
1765
1766 static int call_critical_overtemp(void)
1767 {
1768 char *argv[] = { critical_overtemp_path, NULL };
1769 static char *envp[] = { "HOME=/",
1770 "TERM=linux",
1771 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
1772 NULL };
1773
1774 return call_usermodehelper(critical_overtemp_path, argv, envp, 0);
1775 }
1776
1777
1778 /*
1779 * Here's the kernel thread that calls the various control loops
1780 */
1781 static int main_control_loop(void *x)
1782 {
1783 daemonize("kfand");
1784
1785 DBG("main_control_loop started\n");
1786
1787 down(&driver_lock);
1788
1789 if (start_fcu() < 0) {
1790 printk(KERN_ERR "kfand: failed to start FCU\n");
1791 up(&driver_lock);
1792 goto out;
1793 }
1794
1795 /* Set the PCI fan once for now on non-RackMac */
1796 if (!rackmac)
1797 set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
1798
1799 /* Initialize ADCs */
1800 initialize_adc(&cpu_state[0]);
1801 if (cpu_state[1].monitor != NULL)
1802 initialize_adc(&cpu_state[1]);
1803
1804 fcu_tickle_ticks = FCU_TICKLE_TICKS;
1805
1806 up(&driver_lock);
1807
1808 while (state == state_attached) {
1809 unsigned long elapsed, start;
1810
1811 start = jiffies;
1812
1813 down(&driver_lock);
1814
1815 /* Tickle the FCU just in case */
1816 if (--fcu_tickle_ticks < 0) {
1817 fcu_tickle_ticks = FCU_TICKLE_TICKS;
1818 tickle_fcu();
1819 }
1820
1821 /* First, we always calculate the new DIMMs state on an Xserve */
1822 if (rackmac)
1823 do_monitor_dimms(&dimms_state);
1824
1825 /* Then, the CPUs */
1826 if (cpu_pid_type == CPU_PID_TYPE_COMBINED)
1827 do_monitor_cpu_combined();
1828 else if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) {
1829 do_monitor_cpu_rack(&cpu_state[0]);
1830 if (cpu_state[1].monitor != NULL)
1831 do_monitor_cpu_rack(&cpu_state[1]);
1832 // better deal with UP
1833 } else {
1834 do_monitor_cpu_split(&cpu_state[0]);
1835 if (cpu_state[1].monitor != NULL)
1836 do_monitor_cpu_split(&cpu_state[1]);
1837 // better deal with UP
1838 }
1839 /* Then, the rest */
1840 do_monitor_backside(&backside_state);
1841 if (rackmac)
1842 do_monitor_slots(&slots_state);
1843 else
1844 do_monitor_drives(&drives_state);
1845 up(&driver_lock);
1846
1847 if (critical_state == 1) {
1848 printk(KERN_WARNING "Temperature control detected a critical condition\n");
1849 printk(KERN_WARNING "Attempting to shut down...\n");
1850 if (call_critical_overtemp()) {
1851 printk(KERN_WARNING "Can't call %s, power off now!\n",
1852 critical_overtemp_path);
1853 machine_power_off();
1854 }
1855 }
1856 if (critical_state > 0)
1857 critical_state++;
1858 if (critical_state > MAX_CRITICAL_STATE) {
1859 printk(KERN_WARNING "Shutdown timed out, power off now !\n");
1860 machine_power_off();
1861 }
1862
1863 // FIXME: Deal with signals
1864 elapsed = jiffies - start;
1865 if (elapsed < HZ)
1866 schedule_timeout_interruptible(HZ - elapsed);
1867 }
1868
1869 out:
1870 DBG("main_control_loop ended\n");
1871
1872 ctrl_task = 0;
1873 complete_and_exit(&ctrl_complete, 0);
1874 }
1875
1876 /*
1877 * Dispose the control loops when tearing down
1878 */
1879 static void dispose_control_loops(void)
1880 {
1881 dispose_cpu_state(&cpu_state[0]);
1882 dispose_cpu_state(&cpu_state[1]);
1883 dispose_backside_state(&backside_state);
1884 dispose_drives_state(&drives_state);
1885 dispose_slots_state(&slots_state);
1886 dispose_dimms_state(&dimms_state);
1887 }
1888
1889 /*
1890 * Create the control loops. U3-0 i2c bus is up, so we can now
1891 * get to the various sensors
1892 */
1893 static int create_control_loops(void)
1894 {
1895 struct device_node *np;
1896
1897 /* Count CPUs from the device-tree, we don't care how many are
1898 * actually used by Linux
1899 */
1900 cpu_count = 0;
1901 for (np = NULL; NULL != (np = of_find_node_by_type(np, "cpu"));)
1902 cpu_count++;
1903
1904 DBG("counted %d CPUs in the device-tree\n", cpu_count);
1905
1906 /* Decide the type of PID algorithm to use based on the presence of
1907 * the pumps, though that may not be the best way, that is good enough
1908 * for now
1909 */
1910 if (rackmac)
1911 cpu_pid_type = CPU_PID_TYPE_RACKMAC;
1912 else if (machine_is_compatible("PowerMac7,3")
1913 && (cpu_count > 1)
1914 && fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID
1915 && fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) {
1916 printk(KERN_INFO "Liquid cooling pumps detected, using new algorithm !\n");
1917 cpu_pid_type = CPU_PID_TYPE_COMBINED;
1918 } else
1919 cpu_pid_type = CPU_PID_TYPE_SPLIT;
1920
1921 /* Create control loops for everything. If any fail, everything
1922 * fails
1923 */
1924 if (init_cpu_state(&cpu_state[0], 0))
1925 goto fail;
1926 if (cpu_pid_type == CPU_PID_TYPE_COMBINED)
1927 fetch_cpu_pumps_minmax();
1928
1929 if (cpu_count > 1 && init_cpu_state(&cpu_state[1], 1))
1930 goto fail;
1931 if (init_backside_state(&backside_state))
1932 goto fail;
1933 if (rackmac && init_dimms_state(&dimms_state))
1934 goto fail;
1935 if (rackmac && init_slots_state(&slots_state))
1936 goto fail;
1937 if (!rackmac && init_drives_state(&drives_state))
1938 goto fail;
1939
1940 DBG("all control loops up !\n");
1941
1942 return 0;
1943
1944 fail:
1945 DBG("failure creating control loops, disposing\n");
1946
1947 dispose_control_loops();
1948
1949 return -ENODEV;
1950 }
1951
1952 /*
1953 * Start the control loops after everything is up, that is create
1954 * the thread that will make them run
1955 */
1956 static void start_control_loops(void)
1957 {
1958 init_completion(&ctrl_complete);
1959
1960 ctrl_task = kernel_thread(main_control_loop, NULL, SIGCHLD | CLONE_KERNEL);
1961 }
1962
1963 /*
1964 * Stop the control loops when tearing down
1965 */
1966 static void stop_control_loops(void)
1967 {
1968 if (ctrl_task != 0)
1969 wait_for_completion(&ctrl_complete);
1970 }
1971
1972 /*
1973 * Attach to the i2c FCU after detecting U3-1 bus
1974 */
1975 static int attach_fcu(void)
1976 {
1977 fcu = attach_i2c_chip(FAN_CTRLER_ID, "fcu");
1978 if (fcu == NULL)
1979 return -ENODEV;
1980
1981 DBG("FCU attached\n");
1982
1983 return 0;
1984 }
1985
1986 /*
1987 * Detach from the i2c FCU when tearing down
1988 */
1989 static void detach_fcu(void)
1990 {
1991 if (fcu)
1992 detach_i2c_chip(fcu);
1993 fcu = NULL;
1994 }
1995
1996 /*
1997 * Attach to the i2c controller. We probe the various chips based
1998 * on the device-tree nodes and build everything for the driver to
1999 * run, we then kick the driver monitoring thread
2000 */
2001 static int therm_pm72_attach(struct i2c_adapter *adapter)
2002 {
2003 down(&driver_lock);
2004
2005 /* Check state */
2006 if (state == state_detached)
2007 state = state_attaching;
2008 if (state != state_attaching) {
2009 up(&driver_lock);
2010 return 0;
2011 }
2012
2013 /* Check if we are looking for one of these */
2014 if (u3_0 == NULL && !strcmp(adapter->name, "u3 0")) {
2015 u3_0 = adapter;
2016 DBG("found U3-0\n");
2017 if (k2 || !rackmac)
2018 if (create_control_loops())
2019 u3_0 = NULL;
2020 } else if (u3_1 == NULL && !strcmp(adapter->name, "u3 1")) {
2021 u3_1 = adapter;
2022 DBG("found U3-1, attaching FCU\n");
2023 if (attach_fcu())
2024 u3_1 = NULL;
2025 } else if (k2 == NULL && !strcmp(adapter->name, "mac-io 0")) {
2026 k2 = adapter;
2027 DBG("Found K2\n");
2028 if (u3_0 && rackmac)
2029 if (create_control_loops())
2030 k2 = NULL;
2031 }
2032 /* We got all we need, start control loops */
2033 if (u3_0 != NULL && u3_1 != NULL && (k2 || !rackmac)) {
2034 DBG("everything up, starting control loops\n");
2035 state = state_attached;
2036 start_control_loops();
2037 }
2038 up(&driver_lock);
2039
2040 return 0;
2041 }
2042
2043 /*
2044 * Called on every adapter when the driver or the i2c controller
2045 * is going away.
2046 */
2047 static int therm_pm72_detach(struct i2c_adapter *adapter)
2048 {
2049 down(&driver_lock);
2050
2051 if (state != state_detached)
2052 state = state_detaching;
2053
2054 /* Stop control loops if any */
2055 DBG("stopping control loops\n");
2056 up(&driver_lock);
2057 stop_control_loops();
2058 down(&driver_lock);
2059
2060 if (u3_0 != NULL && !strcmp(adapter->name, "u3 0")) {
2061 DBG("lost U3-0, disposing control loops\n");
2062 dispose_control_loops();
2063 u3_0 = NULL;
2064 }
2065
2066 if (u3_1 != NULL && !strcmp(adapter->name, "u3 1")) {
2067 DBG("lost U3-1, detaching FCU\n");
2068 detach_fcu();
2069 u3_1 = NULL;
2070 }
2071 if (u3_0 == NULL && u3_1 == NULL)
2072 state = state_detached;
2073
2074 up(&driver_lock);
2075
2076 return 0;
2077 }
2078
2079 static int fan_check_loc_match(const char *loc, int fan)
2080 {
2081 char tmp[64];
2082 char *c, *e;
2083
2084 strlcpy(tmp, fcu_fans[fan].loc, 64);
2085
2086 c = tmp;
2087 for (;;) {
2088 e = strchr(c, ',');
2089 if (e)
2090 *e = 0;
2091 if (strcmp(loc, c) == 0)
2092 return 1;
2093 if (e == NULL)
2094 break;
2095 c = e + 1;
2096 }
2097 return 0;
2098 }
2099
2100 static void fcu_lookup_fans(struct device_node *fcu_node)
2101 {
2102 struct device_node *np = NULL;
2103 int i;
2104
2105 /* The table is filled by default with values that are suitable
2106 * for the old machines without device-tree informations. We scan
2107 * the device-tree and override those values with whatever is
2108 * there
2109 */
2110
2111 DBG("Looking up FCU controls in device-tree...\n");
2112
2113 while ((np = of_get_next_child(fcu_node, np)) != NULL) {
2114 int type = -1;
2115 const char *loc;
2116 const u32 *reg;
2117
2118 DBG(" control: %s, type: %s\n", np->name, np->type);
2119
2120 /* Detect control type */
2121 if (!strcmp(np->type, "fan-rpm-control") ||
2122 !strcmp(np->type, "fan-rpm"))
2123 type = FCU_FAN_RPM;
2124 if (!strcmp(np->type, "fan-pwm-control") ||
2125 !strcmp(np->type, "fan-pwm"))
2126 type = FCU_FAN_PWM;
2127 /* Only care about fans for now */
2128 if (type == -1)
2129 continue;
2130
2131 /* Lookup for a matching location */
2132 loc = of_get_property(np, "location", NULL);
2133 reg = of_get_property(np, "reg", NULL);
2134 if (loc == NULL || reg == NULL)
2135 continue;
2136 DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);
2137
2138 for (i = 0; i < FCU_FAN_COUNT; i++) {
2139 int fan_id;
2140
2141 if (!fan_check_loc_match(loc, i))
2142 continue;
2143 DBG(" location match, index: %d\n", i);
2144 fcu_fans[i].id = FCU_FAN_ABSENT_ID;
2145 if (type != fcu_fans[i].type) {
2146 printk(KERN_WARNING "therm_pm72: Fan type mismatch "
2147 "in device-tree for %s\n", np->full_name);
2148 break;
2149 }
2150 if (type == FCU_FAN_RPM)
2151 fan_id = ((*reg) - 0x10) / 2;
2152 else
2153 fan_id = ((*reg) - 0x30) / 2;
2154 if (fan_id > 7) {
2155 printk(KERN_WARNING "therm_pm72: Can't parse "
2156 "fan ID in device-tree for %s\n", np->full_name);
2157 break;
2158 }
2159 DBG(" fan id -> %d, type -> %d\n", fan_id, type);
2160 fcu_fans[i].id = fan_id;
2161 }
2162 }
2163
2164 /* Now dump the array */
2165 printk(KERN_INFO "Detected fan controls:\n");
2166 for (i = 0; i < FCU_FAN_COUNT; i++) {
2167 if (fcu_fans[i].id == FCU_FAN_ABSENT_ID)
2168 continue;
2169 printk(KERN_INFO " %d: %s fan, id %d, location: %s\n", i,
2170 fcu_fans[i].type == FCU_FAN_RPM ? "RPM" : "PWM",
2171 fcu_fans[i].id, fcu_fans[i].loc);
2172 }
2173 }
2174
2175 static int fcu_of_probe(struct of_device* dev, const struct of_device_id *match)
2176 {
2177 state = state_detached;
2178
2179 /* Lookup the fans in the device tree */
2180 fcu_lookup_fans(dev->node);
2181
2182 /* Add the driver */
2183 return i2c_add_driver(&therm_pm72_driver);
2184 }
2185
2186 static int fcu_of_remove(struct of_device* dev)
2187 {
2188 i2c_del_driver(&therm_pm72_driver);
2189
2190 return 0;
2191 }
2192
2193 static struct of_device_id fcu_match[] =
2194 {
2195 {
2196 .type = "fcu",
2197 },
2198 {},
2199 };
2200
2201 static struct of_platform_driver fcu_of_platform_driver =
2202 {
2203 .name = "temperature",
2204 .match_table = fcu_match,
2205 .probe = fcu_of_probe,
2206 .remove = fcu_of_remove
2207 };
2208
2209 /*
2210 * Check machine type, attach to i2c controller
2211 */
2212 static int __init therm_pm72_init(void)
2213 {
2214 struct device_node *np;
2215
2216 rackmac = machine_is_compatible("RackMac3,1");
2217
2218 if (!machine_is_compatible("PowerMac7,2") &&
2219 !machine_is_compatible("PowerMac7,3") &&
2220 !rackmac)
2221 return -ENODEV;
2222
2223 printk(KERN_INFO "PowerMac G5 Thermal control driver %s\n", VERSION);
2224
2225 np = of_find_node_by_type(NULL, "fcu");
2226 if (np == NULL) {
2227 /* Some machines have strangely broken device-tree */
2228 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
2229 if (np == NULL) {
2230 printk(KERN_ERR "Can't find FCU in device-tree !\n");
2231 return -ENODEV;
2232 }
2233 }
2234 of_dev = of_platform_device_create(np, "temperature", NULL);
2235 if (of_dev == NULL) {
2236 printk(KERN_ERR "Can't register FCU platform device !\n");
2237 return -ENODEV;
2238 }
2239
2240 of_register_platform_driver(&fcu_of_platform_driver);
2241
2242 return 0;
2243 }
2244
2245 static void __exit therm_pm72_exit(void)
2246 {
2247 of_unregister_platform_driver(&fcu_of_platform_driver);
2248
2249 if (of_dev)
2250 of_device_unregister(of_dev);
2251 }
2252
2253 module_init(therm_pm72_init);
2254 module_exit(therm_pm72_exit);
2255
2256 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
2257 MODULE_DESCRIPTION("Driver for Apple's PowerMac G5 thermal control");
2258 MODULE_LICENSE("GPL");
2259
WRT350N Kernel Patches